CBS News reported that Tsarnaev, 19, wrote the message on an inside wall in the boat in which he was found.

“When you attack one Muslim, you attack all Muslims,” the note said.

Tsarnaev is charged in connection with the Boston Marathon bombings—which he is suspected of committing with his brother, Tamerlan Tsarnaev, 26, who was killed in a police pursuit following the bombings.

Politico reported that Tsarnaev wrote the note in the boat as police were closing in on him in their search.